FI773962A - ELEKTRONISK KRETS FOER EN TELEFON - Google Patents

ELEKTRONISK KRETS FOER EN TELEFON

Info

Publication number
FI773962A
FI773962A FI773962A FI773962A FI773962A FI 773962 A FI773962 A FI 773962A FI 773962 A FI773962 A FI 773962A FI 773962 A FI773962 A FI 773962A FI 773962 A FI773962 A FI 773962A
Authority
FI
Finland
Prior art keywords
elektronisk
telefon
krets
foer
krets foer
Prior art date
Application number
FI773962A
Other languages
Finnish (fi)
Inventor
Arthur David Moore
Original Assignee
Northern Telecom Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Northern Telecom Ltd filed Critical Northern Telecom Ltd
Publication of FI773962A publication Critical patent/FI773962A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6025—Substation equipment, e.g. for use by subscribers including speech amplifiers implemented as integrated speech networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
FI773962A 1977-01-10 1977-12-29 ELEKTRONISK KRETS FOER EN TELEFON FI773962A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA269,418A CA1056970A (en) 1977-01-10 1977-01-10 Electronic network for telephone set

Publications (1)

Publication Number Publication Date
FI773962A true FI773962A (en) 1978-07-11

Family

ID=4107699

Family Applications (1)

Application Number Title Priority Date Filing Date
FI773962A FI773962A (en) 1977-01-10 1977-12-29 ELEKTRONISK KRETS FOER EN TELEFON

Country Status (13)

Country Link
US (1) US4133983A (en)
JP (1) JPS5387604A (en)
CA (1) CA1056970A (en)
DE (1) DE2800875A1 (en)
DK (1) DK9278A (en)
ES (1) ES465856A1 (en)
FI (1) FI773962A (en)
FR (1) FR2377125A1 (en)
GB (1) GB1543300A (en)
IT (1) IT1089420B (en)
NL (1) NL7714174A (en)
NO (1) NO780077L (en)
SE (1) SE414444B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2906084C2 (en) * 1979-02-15 1981-10-08 Deutsche Telephonwerke Und Kabelindustrie Ag, 1000 Berlin Circuit arrangement for the transmission of voice-frequency signals in telephone systems
US4354060A (en) * 1979-07-26 1982-10-12 Stromberg-Carlson Corporation Electronic telephone
DE2946306C2 (en) * 1979-11-16 1987-02-26 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Amplifier circuit with predeterminable AC internal resistance
US4332984A (en) * 1979-12-13 1982-06-01 Bell Telephone Laboratories, Incorporated Active speech network circuit for a telephone set
FR2487611B1 (en) * 1980-07-22 1987-10-30 Telephonie Ind Commerciale VOICE FREQUENCY KEYBOARD INTERFACE CIRCUIT
IL63653A (en) * 1980-08-29 1984-05-31 Western Electric Co Line powered transformer-less loudspeaking telephone
US4488006A (en) * 1982-07-01 1984-12-11 At&T Bell Laboratories Apparatus for controlling the application of telephone line power in a telephone set

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3462560A (en) * 1966-04-06 1969-08-19 Bell Telephone Labor Inc Subscriber telephone circuit with resistance hybrid sidetone balancing network
BE759917A (en) * 1969-12-08 1971-05-17 Western Electric Co ACOUSTIC FREQUENCY NETWORK
US3691311A (en) * 1970-12-10 1972-09-12 Pacific Plantronics Inc Telephone user set
GB1406663A (en) * 1972-08-22 1975-09-17 Standard Telephones Cables Ltd Telphone subset circuits
IT1024530B (en) * 1974-03-21 1978-07-20 Sits Soc It Telecom Siemens AMPLIFIED TELEPHONE CIRCUIT WITHOUT TRANSFORMER
US3899646A (en) * 1974-05-28 1975-08-12 Bell Telephone Labor Inc Telephone set speech network
SE7415220L (en) * 1974-12-04 1976-05-17 Ericsson Telefon Ab L M INTEGRATED AMPLIFIER
US3963876A (en) * 1975-06-30 1976-06-15 Bell Telephone Laboratories, Incorporated Amplifier circuit for increasing transmit and receive levels in a telephone hybrid network
US4071713A (en) * 1976-12-27 1978-01-31 Northern Telecom Limited Telephone speech network

Also Published As

Publication number Publication date
ES465856A1 (en) 1978-10-01
DK9278A (en) 1978-07-11
NO780077L (en) 1978-07-11
SE414444B (en) 1980-07-28
GB1543300A (en) 1979-04-04
CA1056970A (en) 1979-06-19
JPS5387604A (en) 1978-08-02
IT1089420B (en) 1985-06-18
DE2800875A1 (en) 1978-07-13
SE7800212L (en) 1978-07-11
NL7714174A (en) 1978-07-12
FR2377125A1 (en) 1978-08-04
US4133983A (en) 1979-01-09

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Legal Events

Date Code Title Description
FD Application lapsed

Owner name: NORTHERN TELECOM LTD